It might be a stretch, but I think the Mossad working with the Kurds might possibly snatch a Russian fighter jet from a Syrian airbase.
However, the Russians may not be fool enough to leave one of their 'good' jets on the ground in Syria...
I don’t want their export jet. I think a good continued relation with India could solve that data quest. I want us to get one of their export S-400 birds (and maybe one of the missile control vans). Dream on, dream on....